Secondary Battery Electrode Coating With Guide Members for Uniform Layers
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Solution Overview
Problem
During double-sided coating of an electrode current collector for secondary batteries, coating imbalances occur due to surface tension, leading to non-uniform active material layers and potential ignition risks.
Innovation Solution
A method and apparatus involving the use of guide members on either side of the electrode current collector, with a cleaner integrated into the guide member to continuously remove excess active material, ensuring uniform coating and preventing coating imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If double-sided coating is performed on the electrode current collector, then productivity is improved, but coating precision deteriorates due to surface tension causing non-uniform active material layers
Solution Approach 1:
A guide member is introduced as an intermediary component between the coating head and the electrode current collector. The guide member has a specific cross-sectional shape that acts as a mediator to control the coating process, ensuring uniform active material layer formation while maintaining high productivity through continuous double-sided coating operations
2Device complexity
If coating is performed without guide members, then device complexity is reduced, but coating precision deteriorates with droplet-shaped boundaries and height differences
Solution Approach 1:
The guide member serves as a simple yet effective intermediary component that prevents droplet-shaped boundary formation and height differences in the active material layer. Its specific cross-sectional shape provides the necessary geometric control without requiring complex coating apparatus structures
Solution Approach 2:
The guide member's cross-sectional shape parameters are specifically designed to control the coating process. By changing the geometric parameters of the guide member, uniform coating boundaries and consistent active material layer height are achieved without increasing device complexity
3Adaptability or versatility
If coating width changes due to surface tension during rolling, then coating flexibility is improved, but reliability deteriorates with gaps forming between active material layers
Solution Approach 1:
The guide member acts as a mediator that maintains consistent coating width and prevents gap formation between active material layers on opposite sides of the electrode current collector. This eliminates the reliability issue of potential ignition while preserving the ability to adapt to different coating requirements through guide member design variations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents coating imbalances and ensures uniform active material layers on both sides of the electrode current collector, reducing the risk of ignition and improving the efficiency of the coating process.
Implementation Method 1
a cleaner integrated into the guide member to continuously remove excess active material
Implementation Method 2
a difference in coating loading level is generated by surface tension in the process of coating the active material, which causes a problem that the thickness of the active material layer 20 is not uniform. In other words, the end portion of the active material layer 20 corresponding to a boundary between the non-coated portion 16 and the coated portion 15 is formed not vertically but is formed in a droplet shape
Data Source
Figure 1~2(b)
Figure 3~4
Figure 5~6
AI summary
A method of coating an active material for a secondary battery according to one embodiment of the present disclosure is a method of coating an active material on an electrode current collector of a secondary battery, the method comprising the steps of: disposing a guide member on each of the left and right sides based on a moving direction of the electrode current collector, and coating the active material onto the electrode current collector between the two guide members.